diff --git a/frontend/assets/scripts/WsSessionMgr.js b/frontend/assets/scripts/WsSessionMgr.js
index f371df3..1f33261 100644
--- a/frontend/assets/scripts/WsSessionMgr.js
+++ b/frontend/assets/scripts/WsSessionMgr.js
@@ -271,13 +271,6 @@ window.initPersistentSessionClient = function(onopenCb, expectedRoomId) {
   clientSession.onclose = function(evt) {
     // [WARNING] The callback "onclose" might be called AFTER the webpage is refreshed with "1001 == evt.code".
     console.warn(`The WS clientSession is closed: evt=${JSON.stringify(evt)}, evt.code=${evt.code}`);
-    if (cc.sys.isNative) {
-      if (mapIns.frameDataLoggingEnabled) {
-        console.warn(`${mapIns._stringifyRdfIdToActuallyUsedInput()}
-`);
-      }
-      DelayNoMore.UdpSession.closeUdpSession();
-    }
     switch (evt.code) {
       case constants.RET_CODE.CLIENT_MISMATCHED_RENDER_FRAME:
         break;
@@ -316,8 +309,18 @@ window.initPersistentSessionClient = function(onopenCb, expectedRoomId) {
         mapIns.popupSimplePressToGo("Disconnected unexpectedly, please retry", false, () => {
           window.clearLocalStorageAndBackToLoginScene(true);
         });
-        break;
       default:
+        if (cc.sys.isNative) {
+          // [WARNING] This could be a BUG in CocosCreator JSB implementation of WebSocket client, the "evt.code" is always "undefined" in the "onclose" callback!
+          if (mapIns.frameDataLoggingEnabled) {
+            console.warn(`${mapIns._stringifyRdfIdToActuallyUsedInput()}
+`);
+          }
+          DelayNoMore.UdpSession.closeUdpSession();
+          mapIns.popupSimplePressToGo("Disconnected unexpectedly, please retry", false, () => {
+            window.clearLocalStorageAndBackToLoginScene(true);
+          });
+        }
         break;
     }
   };